The NXP LPC2468 ARM7 based device has, I think, about 160 I/O pins. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=568-4261-ND . You will need to use many for the data and address bus and then some for Ethernet, USB and SD card interfaces but you could have at least 30 or 40 left for whatever you want. Several have ADCs, DAC, PWM, serial ports and all kinds of options. These run for about $14 in small quantities.
One drawback is that the ARM7 doesn't have a MMU. That's fine for uClinux but if you want more power I would go with an ARM9 that can run regular Linux with a MMU. The LPC3130 has about 20 I/O pins you can use I think. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=568-4696-ND Overcomes some problems with running open source Linux apps and runs around 180MHz instead of 72MHz. They are even cheaper around $5.60 in low quantities and around $4 if you buy 100 at a time. My current project is with a LPC2468 and I connected the bus to an FPGA that gives me tons of I/O and hardware processing. Very easy interface to the processor bus. Your code simply reads and writes memory mapped registers in the FPGA to expand the custom I/O. I am currently monitoring 32 inputs and controlling 14 relays over the internet. This does add some cost but the Xilinx Spartan 3A with 50K gate is only about $5.50. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=122-1592-ND Gary -----Original Message----- From: uclinux-dev-boun...@uclinux.org [mailto:uclinux-dev-boun...@uclinux.org] On Behalf Of Erwin Authried Sent: Tuesday, November 03, 2009 6:15 AM To: uClinux development list Subject: Re: [uClinux-dev] Cheapest uClinux hardware you will hardly find some ultra cheap board with tons of i/o pins. If you are lucky, there are a few leds or button inputs that you can use for i/o. If controlling relays is all you want, you can use something like TI's power shift registers (TPIC6B595) to control as many relays as you like with four output lines. -Erwin Am Dienstag, den 03.11.2009, 12:56 +0100 schrieb Tom Mayer: > Hi list, > > I searched several hours but didn't get any results. > > Is there any overview of running uClinux hardware? > > I am searching for the cheapest hardware (processor, not complete dev > boards) for running: > > uclinux > ethernet 10/100 > ssh server > > There should be at least 20 i/o pins for submitting signals. > I want to do some research for university. The board should control > several relais over internet. > > > > Best Regards, > > Tom > _______________________________________________ > uClinux-dev mailing list > uClinux-dev@uclinux.org > http://mailman.uclinux.org/mailman/listinfo/uclinux-dev > This message was resent by uclinux-dev@uclinux.org > To unsubscribe see: > http://mailman.uclinux.org/mailman/options/uclinux-dev -- Dipl.-Ing. Erwin Authried Softwareentwicklung und Systemdesign _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
